Obstetric Anal Sphincter Injuries (OASIS)
Obstetric Anal Sphincter Injuries (OASIS) OASIS injuries can be a significant complication of vaginal deliveries. Obstetric Anal Sphincter Injuries Obstetric Anal Sphincter Injuries (OASIS) are significant complications of vaginal delivery involving damage to the anal sphincter complex. Injuries include third-degree tears, where the anal sphincter is partially or fully damaged, and fourth-degree tears, which extend…